Re-pair Achieves High-Order Entropy

Re-pair Achieves High-Order Entropy
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修复实现高阶熵

DOI:
10.1109/dcc.2008.79
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发表时间:
2008
期刊:
Data Compression Conference (dcc 2008)
影响因子:
--
通讯作者:
L. Russo
L. Russo
中科院分区:
--
文献类型:
--
作者:
G. Navarro;L. Russo

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RePair是J. Larsson和A. Moffat在1999年发明的一种基于字典的压缩方法[基于离线词典的压缩。 Proc。 IEEE,88(11):1722-1732,2000],现在缺乏效率分析。我们表明,对于任何k = o(logsigma n),re pair在大小sigma的字母上压缩一个序列t [1,n]至最多为2nhk + o(n log sigma)位,其中hk是经典的信息理论或经验K-th Order熵(在后者中,从序列统计数据推断出该模型)。
Re-pair is a dictionary-based compression method invented in 1999 by J. Larsson and A. Moffat [Off-line dictionary-based compression. Proc. IEEE, 88(11):1722-1732, 2000], lacking up to now an efficiency analysis. We show that re-pair compresses a sequence T[1,n] over an alphabet of size sigma to at most 2nHk + o(n log sigma) bits, for any k = o(logsigma n), where Hk is either the classical information-theory or the empirical k-th order entropy (in the latter, the model is inferred from the sequence statistics).